Diablo's Bi-Metal teeth jig saw blades are specifically designed for maximum durability, longer life and speed in clean wood applications. These high-performance blades feature an ultra hardened cutting edge to deliver up to 5X longer life than standard blades. The optimized blade design reduces heat and pitch build up; for fast, clean cuts. T-shank design fits all combo and most U-shank cordless and corded jig saws.